タイマの実装について

  
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Diagnostics;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main( string[] args ) {

            Stopwatch sw = new Stopwatch();
            double period = 1; /// 2[msec]
            double p1 = sw.Elapsed.TotalMilliseconds - period; /// 前回値格納
            double p2 = sw.Elapsed.TotalMilliseconds; /// 今回値格納


            while(true) {
                if((p2 - p1) >= period) {
                    p1 = p2;

                    /// コールバック関数呼び出し
                    anyCallback();
                }
                p2 = sw.Elapsed.TotalMilliseconds;

            }
        }
        static void anyCallback() {/* ... */}
    }
}